58 4. PYRENULACEAE [24. Pyrenulella 



5. Pyrenula nitida (Weig.) Ach., Ges. Naturf. Freund. Mag. 6:21. 1814. 

 Sphaeria nitida Weig., Ubs. Bot. 45. pi. 2, f. 14. 1772. Verrucaria nitida (Weig.) 



Schrad. P. nitida var. nitidella Floerke. P. nitidella (Floerke) Mull. Arg. 



Thallus rudimentary, the superficial portion limited or sometimes rather wide- 

 spread, very thin, somewhat shining, greenish gray to grayish brown; perithecia 

 middle-sized to large, 0.3-0.9 mm. across, often clustered and becoming conglomer- 

 ate, the wall complete, the superficial portion convex to subhemispherical, black, 

 the ostiole often papillate; spores ellipsoid, 3-septate, 15-28 X 7-12 fi. 



On trees, throughout the United States. 



6. Pyrenula cerina Eschw., Syst. Lich. 25. f. 14. 1824. 



P. aurantiaca Fee. 



Thallus very thin, the superficial portion smooth to somewhat wrinkled, some- 

 times becoming areolate and intersected by dark lines, dull to bright orange, 

 whitish within; perithecia minute, 0.1-0.2 mm. across, partly immersed, the super- 

 ficial portion convex, black, the ostiole minute, rarely visible, indicated by a whitish 

 area, the wall very thin, complete; spores oblong-ellipsoid, 3-septate, 20-35 X 8-13 /*,. 



On trees, Florida. 



7. Pyrenula Herrei Fink; Hedrick, Mycolosiia 25:309. 1933. 



Thallus rudimentary, the superficial portion thin, smooth or obscurely scurfy, 

 ashy or greenish brown to brown; perithecia minute to small, 0.2-0.35 mm. across, 

 partly immersed to adnate, black, often shiny, hemispherical or sometimes sub- 

 globose, the ostiole rarely visible, the wall dimidiate; spores fusiform to ellipsoid, 

 3-septate, 16-20 X 6-8 p. 



On trees, Santa Cruz Peninsula, California. 



OTHER SPECIES REPORTED 

 Pyrenula claudestina Ach. — North America. 

 Pyrenula pinguis (Sprengl.) Fee — Tennessee. 

 Pyrenula pulicina Nyl. — Florida and North Carolina. 



24. Pyrenulella Fink* 



Thallus imbedded in that of the lichen host and therefore invisible; perithecia 

 minute to small, more or less immersed, the superficial portion hemispherical to 

 convex, the ostiole minute, rarely visible, the wall complete; paraphyses un- 

 branched; asci clavate; spores 8, hyaline, ellipsoid to oblong-ellipsoid, 3-septate, 

 the cells lenticular. 



The algal host is Protococcus. 



1. Pyrenulella endococcoidea (Nyl.) Fink n. comb. 



Verrucaria endococcoidea Nyl., Flora 48:356. 1865. 



Thallus imbedded in the lichen host and therefore invisible; perithecia minute, 

 globular, the superficial portion convex, black; spores 3-septate, oblong-ellipsoid, 

 14-18 X 5-7 /i. 



On Buellia petraea, Massachusetts. 



25. Anthracothecium Hampe, in Mass., Atti 1st. 

 Veneto III. 5:330. 1860. 



Thallus forming a thin, smooth to slightly rough crust upon the substratum, 

 partly or wholly within the substratum, devoid of differentiation into layers; 

 perithecia minute to small or rarely middle-sized or larger, more or less immersed 

 in thalloid warts, the wall complete or dimidiate, the superficial portion convex 

 to conical, the ostiole minute to small, more or less visible; paraphyses un- 

 branched, free; asci clavate to cylindrico-clavate; spores commonly 8, brownish 

 to brown, oblong-ellipsoid to ellipsoid to fusiform, transversely and longitudinally 

 septate, the cells lenticular. 



The algal host is Trentepohlia. 



* Pyrenulella Fink gen. nov. A Pyrenula Mass, thallo parasitico et inconspicuo, in hos- 

 pitis thallo immerso differens. 



